Display apparatus having heat dissipation

• US 6,249,267 B1
• Filed: 02/19/1997
• Issued: 06/19/2001
• Est. Priority Date: 02/19/1996
• Status: Expired due to Fees

• Current Assignee: ROHM Co., Ltd.
• Original Assignee: ROHM Co., Ltd.
• Inventors: Ishihara, Takayuki
• Primary Examiner(s): Mengistu, Amare
• Application Number:
  US08/802,264
• Time in Patent Office: 1,581 Days
• Field of Search: 345/80, 345/82, 313/503, 313/498, 315/169.3
• US Class Current: 345/82
• CPC Class Codes: H05K 1/0201 Thermal arrangements, e.g. for cooling, heating or preventing overheating
• CPC Class Codes: H05K 1/0203 Cooling of mounted components H05K1/0272 takes precedence
• CPC Class Codes: H05K 1/056 the metal substrate being covered by an organic insulating layer
• CPC Class Codes: H05K 1/18 Printed circuits structurally associated with non-printed electric components H05K1/0201, H05K1/023, H05K1/0243, and H05K1/16 take precedence
• CPC Class Codes: H05K 2201/10106 Light emitting diode [LED]
• CPC Class Codes: H05K 2201/10128 Display

Abstract

Disclosed is a display apparatus comprising a printed board mounting on one surface with light elitting elements in a matrix form and on the other surface with control components for controlling the drive for the light emitting elements. The printed board is formed by a heat conductive substrate of such as a metal plate and electrically insulative members formed on respective surfaces thereof. The printed board is electrically insulative at the respective surfaces but excellent in heat conductivity. Accordingly, the printed board provided is excellent in heat conductivity so that heat developed by the light emitting elements or control components can be dissipated outside with high efficiency. There is no necessity of reducing driving electric power to low or no fear of incurring degradation of the components or display characteristics.

Claims

1. A display apparatus comprising:

a heat conductive substrate;

first and second electrically insulative members formed on respective surfaces of said heat conductive substrate;

light emitting elements arranged in a matrix form on the surface of said first electrically insulative member on one surface of said heat conductive substrate; and

control components arranged on the surface of said second electrically insulative member on the other surface of said heat conductive substrate, wherein said first electrically insulative member on said one surface is formed of at least two layers, the first layer having an interconnect pattern formed on a surface thereof, the second layer being formed with blind through-holes through which said light emitting elements and said interconnect pattern are electrically connected.

2. The display apparatus of claim 1, wherein said heat conductive substrate is formed by a metal plate.

3. A display apparatus comprising:

a heat conductive substrate;

first and second electrically insulative members formed on respective surfaces of said heat conductive substrate;

light emitting elements arranged in a matrix form on the surface of said first electrically insulative member on one surface of said heat conductive substrate; and

control components arranged on the surface of said second electrically insulative member on the other surface of said heat conductive substrate, wherein said second electrically insulative member on said other surface is formed of at least two layers, the first layer having an interconnect pattern formed on a surface thereof, the second layer being formed with blind through-holes through which said control components and said interconnect pattern are electrically connected.

4. A display apparatus comprising:

a heat conductive substrate;

first and second electrically insulative members formed on respective surfaces of said heat conductive substrate;

light emitting elements arranged in a matrix form on the surface of said first electrically insulative member on one surface of said heat conductive substrate; and

control components arranged on the surface of said second electrically insulative member on the other surface of said heat conductive substrate, wherein at least one of said electrically insulative members are partly removed to provide exposed surface to said heat conductive substrate.

5. The display apparatus of claim 4, wherein said heat conductive substrate has a metal fixture on said other surface thereof, said metal fixture being in contact with said exposed surface of said heat conductive substrate, and said metal fixture has a height higher than those of said control components.

6. The display apparatus of claim 5, wherein said metal fixture is formed by a sheet member, and said metal fixture includes an attaching portion projecting higher than said control component.

7. The display apparatus of claim 5, wherein said sheet member has a stepped portion formed projecting to be contacted with said exposed surface of said heat conductive substrate.